Iron-complexes of bis(2-hydroxyethyl)-amino-compounds as mediators for the indirect reduction of dispersed vat dyes – Cyclic voltammetry and spectroelectrochemical experiments

One-pot synthesis, structural characterization, UV–Vis and electrochemical analyses of new Schiff base complexes of Fe(III), Ni(II) and Cu(II)

“…The Fe(III) complex exhibits two quasi-reversible peaks, its cyclic voltammogram displays two reduction peaks: the first one at E pc = −1.223 V with an associated oxidation peak at E pa = −1.061 V and the second reduction peak appears at E pc = −1.547 V, with an associated oxidation peak at E pa = −1.311 V. These peaks can be attributed to the Fe(III)/Fe(II) and Fe(II)/Fe(I) processes respectively, at a scan rate of 100 mV/s [31][32]. The differences in the electrochemical behavior of the first two complexes (Ni and Fe) can be assigned to the ligand field effects.…”

Derivative cathodic stripping voltammetry in the simultaneous determination of three textile dyes in aqueous solutions

“…The azo dye concentration can be determined during an industrial textile dyeing process by employing spectrophotometry or voltammetry methods . Ultraviolet‐visible spectrophotometry has been widely employed owing to its low cost and availability .…”

Voltammetry and spectroelectrochemistry of solid indigo dispersed in carbon paste

“…The water-insoluble indigo is reduced by reducing agents such as sodium dithionite and iron(II) triethanolamine complex to soluble leucoindigo which, having penetrated into the material to be dyed, is oxidized back to the original indigo by oxygen. The reducing agents required in the dyeing process lead to problematic waste products, therefore electrochemical reduction processes, both direct [1][2][3][4] and indirect [5][6][7][8][9], are being developed as an environmentally-friendly alternative to the traditional chemical reduction. In addition, the electrochemical studies of indigo also focused on the redox properties of indigo [10][11][12][13][14][15], the electrochemical determination of indigo species [16][17][18][19][20][21][22][23], and the electro-oxidation of indigo for the treatment of textile wastewaters [24].…”

“…Aqueous indigo suspensions containing dispersants were generally used for studying the electro-reductive dyeing processes [1][2][3][4][5][6][7], while several other strategies [10][11][12][13][14][15][16][17][18][19] were employed to investigate the voltammetric behavior and the redox kinetics of this insoluble compound. Komorsky-Lovrić [10] prepared an aqueous solution of 50 M indigo by vigorous stirring over several days, to measure the voltammetric response of traces of indigo dissolved in water.…”